Aminoalkylenethioimidazoline derivatives



United States Patent ABSTRACT OF THE DISCLOSURE This invention relates to new products broadly described as l-phenyl or substituted phenyl-Z-amino or substituted amino alkylenethioimidazolines and acid addition salts. They are prepared by reaction of a l-phenyl or substituted phenyl-Z-thioimidazoline with an amino or substituted amino alkylene halide. The compounds are useful for their herbicidal activity.

The compounds of this invention may be defined as compounds of the formula:

wherein, A and B are hydrogen or lower alkyl; R and R are hydrogen, halogen, lower alkyl, lower alkoxy and trifluoromethyl; R and R are lower alkyl, lower alkenyl, cycloalkyl and aralkyl;

taken together is pyrrolidinyl, piperidino, hexamethyleneimino, morpholino and lower alkylpiperazinyl; n is an integer from 2 to 4; and the acid addition salts of the above compounds.

The compounds of this invention may be either solids or liquids at room temperature and are relatively insoluble in water but soluble in most organic solvents, such as, for example, alcohols, ethers, esters, ketones, chloroform and the like. These compounds form acid addition salts such as, for example, the hydrochloride, phosphate, citrate, tartrate, maleate, fumarate, etc., which are generally soluble in water, ethanol and methanol and relatively insoluble in non-polar solvents such as lower alkyl ethers or hydrocarbons.

The compounds of this invention are preferably prepared by reacting a 1-aryl-2-imidazolidinethione with an aminoalkyl halide or tosylate. The reaction to prepare the present compounds may be illustrated as follows:

Patented Aug. 1, 1967 wherein R, R R R A, B and n are as hereinbefore defined and X is halogen or arylsulfonyloxy.

The reaction may be carried out in an inert solvent such as toluene, diglyme and the like at a temperature range of about 25 C. to about 150 C. and over a period of time ranging from about one-half hour to eight or more hours. The reaction takes place more readily in the presence of an alkaline condensing agent such as, for example, sodium, sodium hydride, potassium amide and the like.

Among the compounds considered within the scope of the present invention are the following:

1- (m-chlorophenyl -2-[ (3-dimethylaminopropyl) thio] Z-imidazoline;

1- (p-chlorophenyl) -2- (S-dimethylaminopropyl) thio] Z-imidazoline;

1- 3,4-dichlorophenyl) -2- 3-dimethylaminopropyl) thio]-Z-imidazoline;

1- 3-chloro-4-tolyl -2- (3-dimethylaminopropyl thio] 2-irnidazoline;

1-( 3-chloro-4-methoxyphenyl) -2-[ (3-dimethylaminopropyl) thio] -2-imidazoline;

l- (m-trifiuoromethylphenyl) -2- (3-dimethylaminopropyl) thio]-Z-imidazoline;

1- (m-chlorophenyl -2-[ (3-diallylaminopropyl) thio] -2- imidazoline;

1-(m-chlorophenyl)-2-[3-methylcyclohexylaminopropyl) thio]-2-imidazoline;

1- (m-chlorophenyl) -2-[ (3-methylbenzylaminopropyl) thio]-2-imidazoline;

1- (m-chlorophenyl) -2- 2-pyrrolidinylethyl) thio] 2-imidazoline;

1-(rn-chlorophenyl)-2-[ (Z-piperidinoethyl) thio] -2- imidazoline;

1- m-bromophenyl) -2-[ (3 -hexamethylenei.minopropyl) thio] -2-imidazoline 1- m-chlorophenyl) -2-[ (3-morpholinopropyl) thio] Z-imidazoline;

1- m-chlorophenyl -2- (3-methylpiperazinylpropyl) thio]-2-imidazoline, and the like. The compounds of this invention have herbicidal activity. This activity may be demonstrated by the following evaluation procedure. The agar technique of herbicide evaluation consists of placing seeds of test plants on Water agar (1.5%) into which a chemical has been incorporated (initial concentration, 500 ppm.) and over a three-week period observing effects on seed germination,

root growth and shoot growth. The test species are:

(1) Monocots (a) Wheat (var. Genessee) (b) Sweet Corn (var. Golden Cross Bantam) (2) Dicots (a) Radish (var. Early Scarlet Globe) (b) Cucumber (var. Marketer) Ten ml. of each stock solution and/ or suspension mg. solid or 0.1 ml. of liquid chemical in 1 ml. of acetone to which is added 99 ml. of deionized water) is placed into each of four wide-mouth 2-oz. bottles with a 10 ml.

syringe-pipette and then 10 ml. of 3.0% Difco-Bacto agar 3 and cucumber are placed on the surface, one species per bottle. Care is taken to place the corn seed embryos down, to facilitate germination. Seeds of each species placed on 1.5% water agar serve as the control series.

for 12 hours and concentrated to remove the solvent. The residue is poured into ice and water and the precipitate is filtered, washed with water and recrystallized from ethanol. The l-(m-chlorophenyl)-2-imidazolidinethione Two ml. of Water is added to each bottle to help provide melts at 172-174 C. optimum conditions for germination. The bottles are cov- A solution of 10.6 parts of 1-(m-chlorophcnyl)-2- ered for 48 hours with glass plates to minimize the escape imidazolidinethione in 150 parts of diglyme, diethyleneglyof volatile chemicals and with brown kraft paper to facol dimethyl ether, is added dropwise to a mixture of 2.9 cilitate germination. parts of 50% sodium hydride (in mineral oil) in 100 parts The seeds and plants are observed periodically followof diglyme. After the evolution of hydrogen ceases, a soluing treatment and water is added as required. Results are tion of 7.8 parts of 3-dimethylaminopropyl chloride in noted after one week and chemicals that kill the seeds or 75 parts of diglyme is added. The reaction mixture is plants of two or more test species are reevaluated at 100 heated at reflux temperature for 4 hours, cooled and filand 10 p.p.m. using the same stock solution and the same tered. The mother liquor is concentrated to remove solprocedures. Final data are recorded three weeks after vent and the residue is dissolved in ether. The ether layer initial exposure to the chemicals. All plant responses such is washed with water, dried over magnesium sulfate and as suppressed growth, elongated stems or leaves, leaf or concentrated to an oil. The oil is dissolved in ether and root malformation and chlorosis as well as the more obethanolic hydrogen chloride is added. Crystals separate vious symptoms of toxicity are recorded. Any chemical and are filtered off. This product is dissolved in 45 parts that kills two or more species or one that causes unusual by volume of ethanol. The solution is cooled and some responses is advanced to the initial postemergence and impurity is filtered off. The mother liquor is concentrated pre-emergence applied herbicide program. The herbicidal and the residue is dissolved in 15 parts of ethanol and activity of representative examples of compounds of this parts of ether are added. The crystals are filtered off invention is illustrated in Table I. and recrystallized from acetone. The 1-(m-chlorophenyl)- TABLE I PHYTOTOXICITY 5 2 3 dimethylaminopropyl)thio]-2-imidazoline hydro- S (CH2)H N(CHS)Z'HCI chloride melts at 139 -141 C. EXAMPLE 2 N N- Preparation of I-(ms-chlorophenyl)-2-[(Z-pyrrolidinyll l 30 ethyl)thio]-2-imidaz0lirze dihydrochloride 01 When 2-pyrrolidinylethyl chloride is substituted for 3- Activitywpm) dimethylaminopropyl chloride in the procedure of Example 1, 1 (m chlorophenyl)-2-[(2-pyrrolidinylethyl) thio]-2-imidaz0line is obtained. This compound is ison Wheat Radish Cucumber c lated as the dihydrochloride, melting point 189191 C.

EXAMPLE 3 2 500 500 500 3 100 100 00 0 Preparatzon 0f I-(m-chlorophenyl)-2-[(2-dlmethylamznoethyl)-thi0]-2-imidaz0line dimaleate The compounds of this invention are formulated by When Z-dimethylaminoethyl chloride is substituted for admixture with a carrier material as conditioning agent, 3-dimethylaminopropy1 chloride in the procedure of Exin the form of solutions, dusts, water dispersible powders, ample 1, 1-(m-chlorophenyl)-2-[(Z-dimethylaminoethyl) aqueous dispersions and emulsions, in order to utilize the thio]-2-imidazoline is obtained. This compound is charherbicidal activity to best advantage. These formulations acterized as the dimaleate, melting point 122123 C. are suitable for efficient application to soil, weeds or un-. The procedure of Example 1 may also be used to prewanted plants using conventional applicator equipment. pare the following compounds:

Example Reagent A Reagent B Product (Base) 4 1-(m-bromophenyl) 4-methy1-2-imidaz- 3-dimethylaminopropyl chloride l-(m-bromophenyl)-2-[(3-dimethylaminopropyl)- olidinethione. thio]-4-methy1-2-imidazoline. 5 1-(p-fluorophenyl)-5-methyl-2-imidaz- 3-(4-mcthylpiperazinyl)-propyl chloride..- l-(p-fluorophenyl)-2-[3-(4-methylpiperazinyl) olidinethione. propylthio]-5-methyl-2-imidaz0line. 6 1-(m-trifluoromethylphenyl)-2-imidaz- 4-piperidinobutyl chloride l-(mtritluoromethylphenyl)-2-[(4-piperidiuoolidlnethione. butyl)thi0]-2-imidazolinc. 7 1-phenyl-2-imidazolidinethi0ne. 3-hexamethy1eneiminopropyl chloride..." 2-[i(-heagiaitgigleneiminopropyl) thioj-l-phenyl- 8 1-(p-ethylphenyl)-2-imidazo1idinethione. 3-morpholinopropyl chloride l-(zpfe iihilpl lenvl)-2-[(Ii-morph0liuepr0py1)thi0]- 9 l-(m-chlorophenyl)-2-imidazolidinethione 3-cyclopropylmethylaminopropyl chloride. 1-(ni hl i gili nyb-fl(S-cyclopropylmethylamino propyl)thio]-2-imidazoline. 1 3-allylrnethylaminopropyl chloride l-(m-chlorophenyl)-2-[(3-allylmethylaminoropyl)thi0]-2-imidazolinc. 11 l-(m-chlorophenyl)-2-imidazo1idinetl1ione. S-benzylmcthylaminopropyl chloride 2-[ t3-benzylmcthylaminopropyl)thi0]-1-(rnchlorophenyl)-2-imidazo1ine.

The following examples describe in detail the preparation of representative compounds of the present invention.

EXAMPLE 1 Preparation of 1-(m-chl0r0phenyl)-2-[(3-a'imethylamin0- pr0pyl)-thi0]-2-imidaz0line hydrochloride A mixture of parts of 1-(m-chlorophenyl)-2- imidazolidinone, 115 parts of phosphorous pentasulfide and 1000 parts of pyridine is heated at reflux temperature We claim: 1. a compound of the formula:

/R2 nH2n N\ R3 R -Q A| |-B wherein, A and B are selected from the group consisting of hydrogen and lower alkyl; R and R are selected from the group consisting of hydrogen, halogen, lower alkyl, lower alkoxy and trifluoromethyl; R and R are selected from the group consisting of lower alkyl, lower alkenyl, cycloalkyl of 3 to 6 carbon atoms and benzyl:

. &\

taken together is selected from the group consisting of pyrrolidinyl, piperidino, hexamethyleneimino, morpholine and lower alkylpiperazinyl; n is an integer of from 2 to 4 or an acid addition salt thereof.

2. l-(m-halophenyl) 2 [(3 dimethylaminopropyl) thio] -2-irnidazoline.

3. 1 (n1 chlorophenyl)-2-[(3 diloweralkylaminopro pyl thio] -2-imid azo line.

4. The compound l-(m-chlorophenyl)-2-[(3-dimethylaminopropyl) thio] -2-imidazoline.

5. The compound 1-(m-chlorophenyl)-2-[(Z-pyrrolidinylethyl thio] -2-irnidazoline.

6. The compound 1-(m-chlorophenyl)-2-[(Z-dimethylaminoethyl thio] -2-imidazoline.

References Cited UNITED STATES PATENTS 1,912,849 6/1933 Kranzlein et al. 260309.6 2,813,102 11/1957 Winthrop 260309.6 3,190,887 6/1965 Hensley et a1 260309.6

WALTER A. MODANCE, Primary Examiner.

JOHN D. RANDOLPH, Examiner,

NATALIE TROUSOF, Assistant Examiner. 

1. A COMPOUND OF THE FORMULA: 